/**
 * @license Highstock JS v7.2.0 (2019-09-03)
 *
 * Indicator series type for Highstock
 *
 * (c) 2010-2019 Sebastian Bochan
 *
 * License: www.highcharts.com/license
 */
'use strict';
(function (factory) {
    if (typeof module === 'object' && module.exports) {
        factory['default'] = factory;
        module.exports = factory;
    } else if (typeof define === 'function' && define.amd) {
        define('highcharts/indicators/trendline', ['highcharts', 'highcharts/modules/stock'], function (Highcharts) {
            factory(Highcharts);
            factory.Highcharts = Highcharts;
            return factory;
        });
    } else {
        factory(typeof Highcharts !== 'undefined' ? Highcharts : undefined);
    }
}(function (Highcharts) {
    var _modules = Highcharts ? Highcharts._modules : {};
    function _registerModule(obj, path, args, fn) {
        if (!obj.hasOwnProperty(path)) {
            obj[path] = fn.apply(null, args);
        }
    }
    _registerModule(_modules, 'indicators/trendline.src.js', [_modules['parts/Globals.js'], _modules['parts/Utilities.js']], function (H, U) {
        /* *
         *
         *  License: www.highcharts.com/license
         *
         * */



        var isArray = U.isArray;

        var seriesType = H.seriesType;

        /**
         * The Trend line series type.
         *
         * @private
         * @class
         * @name Highcharts.seriesTypes.trendline
         *
         * @augments Highcharts.Series
         */
        seriesType(
            'trendline',
            'sma',
            /**
             * Trendline (linear regression) fits a straight line to the selected data
             * using a method called the Sum Of Least Squares. This series requires the
             * `linkedTo` option to be set.
             *
             * @sample stock/indicators/trendline
             *         Trendline indicator
             *
             * @extends      plotOptions.sma
             * @since        7.1.3
             * @product      highstock
             * @optionparent plotOptions.trendline
             */
            {
                /**
                 * @excluding period
                 */
                params: {
                    /**
                     * The point index which indicator calculations will base. For
                     * example using OHLC data, index=2 means the indicator will be
                     * calculated using Low values.
                     *
                     * @default 3
                     */
                    index: 3
                }
            },
            /**
             * @lends Highcharts.Series#
             */
            {
                nameBase: 'Trendline',
                nameComponents: false,
                getValues: function (series, params) {
                    var xVal = series.xData,
                        yVal = series.yData,
                        LR = [],
                        xData = [],
                        yData = [],
                        sumX = 0,
                        sumY = 0,
                        sumXY = 0,
                        sumX2 = 0,
                        xValLength = xVal.length,
                        index = params.index,
                        alpha, beta, i, x, y;

                    // Get sums:
                    for (i = 0; i < xValLength; i++) {
                        x = xVal[i];
                        y = isArray(yVal[i]) ? yVal[i][index] : yVal[i];
                        sumX += x;
                        sumY += y;
                        sumXY += x * y;
                        sumX2 += x * x;
                    }

                    // Get slope and offset:
                    alpha = (xValLength * sumXY - sumX * sumY) /
                        (xValLength * sumX2 - sumX * sumX);

                    if (isNaN(alpha)) {
                        alpha = 0;
                    }

                    beta = (sumY - alpha * sumX) / xValLength;

                    // Calculate linear regression:
                    for (i = 0; i < xValLength; i++) {
                        x = xVal[i];
                        y = alpha * x + beta;

                        // Prepare arrays required for getValues() method
                        LR[i] = [x, y];
                        xData[i] = x;
                        yData[i] = y;
                    }

                    return {
                        xData: xData,
                        yData: yData,
                        values: LR
                    };
                }
            }
        );

        /**
         * A `TrendLine` series. If the [type](#series.trendline.type) option is not
         * specified, it is inherited from [chart.type](#chart.type).
         *
         * @extends   series,plotOptions.trendline
         * @since     7.1.3
         * @product   highstock
         * @excluding dataParser, dataURL
         * @apioption series.trendline
         */

    });
    _registerModule(_modules, 'masters/indicators/trendline.src.js', [], function () {


    });
}));